body {
  font-family: 'Lato', sans-serif;
  font-size: 16px;
}
.back {
  position: fixed;
  top: 40px;
  left: 40px;
  width: 100px;
}
.back ul {
  display: block;
  margin-bottom: 0;
  list-style: none;
}
.back ul li {
  white-space: nowrap;
}
.back ul li a {
  text-decoration: none;
}
.back ul.nav-history {
  padding-left: 36px;
  padding-top: 25px;
  pointer-events: none;
}
.back ul.nav-history li {
  margin-bottom: 5px;
}
.back ul.nav-history li::after {
  content: '';
  position: absolute;
  left: 12px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #e8eaed;
  transform: scale(0.9);
  transition: all 0.2s ease;
}
.back ul.nav-history li:not(:last-child)::before {
  content: '';
  position: absolute;
  left: 17px;
  margin-top: 10px;
  width: 2px;
  height: 28px;
  background: #e8eaed;
  transition: all 0.2s ease;
}
.back ul.nav-history li.active {
  pointer-events: none;
}
.back ul.nav-history li.active::after {
  background: #e8eaed;
}
.back ul.nav-history li.active a {
  color: #5a667f;
}
.back ul.nav-history li a {
  color: #418ad8;
  display: inline-block;
  opacity: 0;
  transform: translateY(-10px);
  transition: all 0.2s ease;
}
.back ul.nav-history li a:hover {
  color: #2b7cd2;
}
.back ul.nav-links {
  position: absolute;
  transform: translateY(-10px);
  margin-top: 20px;
  padding-left: 12px;
  opacity: 0;
  transition: all 0.2s ease;
  pointer-events: none;
}
.back ul.nav-links li:not(:last-child) {
  margin-bottom: 5px;
}
.back ul.nav-links li a {
  font-size: 14px;
  font-weight: 600;
  color: #c8ccd4;
  transition: color 0.2s ease;
}
.back ul.nav-links li a:hover {
  color: #9098a9;
}
.back:hover {
  width: auto;
}
.back:hover .menu-back {
  opacity: 1;
  transform: translateY(0);
}
.back:hover .btn-back div {
  background: rgba(65,138,216,0.25);
}
.back:hover .btn-back div svg path,
.back:hover .btn-back div svg polyline {
  stroke: #418ad8;
}
.back:hover .btn-back span {
  transform: translateX(0);
  opacity: 1;
}
.back:hover ul.nav-history {
  transform: translateY(0);
  pointer-events: auto;
}
.back:hover ul.nav-history li {
  margin-bottom: 8px;
}
.back:hover ul.nav-history li::after {
  background: #418ad8;
  transform: translateY(6px);
}
.back:hover ul.nav-history li.active::after {
  background: #5a667f;
}
.back:hover ul.nav-history li a {
  opacity: 1;
  transform: translateY(0);
}
.back:hover ul.nav-links {
  position: relative;
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.btn-back {
  display: inline-block;
}
.btn-back div {
  position: relative;
  z-index: 1;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #e8eaed;
  float: left;
}
.btn-back div svg {
  fill: none;
  transform: translate(10px, 7px);
}
.btn-back div svg path,
.btn-back div svg polyline {
  stroke: #9098a9;
  stroke-width: 2;
  stroke-linejoin: round;
  stroke-linecap: round;
}
.btn-back span {
  display: inline-block;
  color: #418ad8;
  margin-left: 10px;
  line-height: 34px;
  opacity: 0;
  transform: translateX(-20px);
  transition: all 0.2s ease;
}
.btn-back:hover span {
  color: #2b7cd2;
}
